CN115174540A - IP Camera access method for supporting RTSP protocol through call control logic - Google Patents
IP Camera access method for supporting RTSP protocol through call control logic Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
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Abstract
The invention discloses an IP Camera access method for supporting RTSP protocol through conversation control logic, belonging to VoIP related field; firstly, configuring parameters of an IP Camera to a VoIP phone which communicates with the IP Camera, calling a calling interface of a call control module to create a call structure body and RTP socket to transmit to an RTSP protocol control module when a user presses a DSSKKey key, sequentially calling a CURL interface, sending a DESCRIBE method of the RTSP protocol to the IP Camera, and replying according to 200 messages to obtain video parameters of the IP Camera; sending a SETUP method of an RTSP protocol to acquire an RTP communication protocol address and a port of an IP Camera; calling a far-end ringing interface of the call control module, finally sending a PLAY method of an RTSP protocol, and requesting the IP Camera to send real-time video data to an RTP communication protocol address and a port of the VoIP phone; meanwhile, the call state is updated to be in the call, and the call is established; and finally, displaying the video captured by the IP Camera on a screen to realize the access of the IP Camera. The invention reduces the software development cost of the VoIP phone for accessing the IP Camera.
Description
Technical Field
The invention belongs to the related field of VoIP (representing 'IP voice' or 'Internet voice protocol'), and particularly relates to an IP Camera (network Camera) access method for supporting an RTSP (real time streaming protocol) through a call control logic.
Background
With the continuous development of embedded technology, the functions and hardware conditions of embedded equipment are continuously improved; the functions of VoIP products developed based on the embedded system are also continuously enriched, and the functions of VoIP products are developed from simple voice communication to audio and video communication, video conference and the like, so that the use requirements of users are continuously met.
IP Camera refers to: the images are converted into data packets based on TCP/IP network standards, so that the pictures shot by the camera are directly transmitted to the network through an Ethernet interface or a WIFI wireless interface, and the pictures can be remotely monitored through the network.
The system is widely applied to the fields of education, commerce, medical treatment and public service such as trans-regional remote monitoring scenes of offices, buildings and the like, linkage careers, large-scale factory rooms, remote nursing of old people and children, public buildings, unmanned dangerous environment monitoring, branch monitoring of various financial institutions, traffic supervision, error alarm identification and the like.
However, professional equipment needs to be used for controlling the IP Camera, professionals need to develop a set of user-friendly interfaces, a large amount of manpower and resources are needed, and for ordinary users, the use cost is high, the use skills of the equipment need to be learned, and the professional ability requirements of the users are increased; the VoIP product is based on a TCP/IP network protocol, has a hardware basis for controlling the IP Camera, is relatively low in price, realizes the support of the RTSP on software, can meet the requirements of some specific application scenes, simplifies the use of users, saves part of expenses, and is favorable for the popularization of VoIP and IP Camera equipment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an IP Camera access method for supporting an RTSP protocol through a call logic, and an IP Camera video is checked by converting the call control logic into the RTSP protocol method; the development workload of technical personnel in the VoIP field is simplified, and the cost is reduced; the user can simply use the device without the reserve of professional knowledge to realize simple application.
The IP Camera access method for supporting the RTSP protocol through the call logic comprises the following specific steps:
step one, aiming at a VoIP phone and an IP Camera which need to be communicated, a user configures parameters of the IP Camera to a function Key DSS Key of the VoIP phone;
the parameter configuration comprises the following steps: URL, username and password of IP Camera;
the VoIP phone comprises a user input module, a call control module, an RTSP control module, a DSP module and a UI module.
A user performs key operation through a user input module, constructs a VoIP call request according to the parameter configuration information of the IP Camera, and calls a call interface of a call control module to perform data processing; the processed data is transmitted to the IP Camera through the RTSP control module; meanwhile, the IP Camera feeds back RTP data to the DSP module, and finally the final video is displayed through the UI module.
Step two, when a user presses a DSS Key Key, a triggering Key processing module reads parameter configuration information of the IP Camera, a VoIP call request is constructed, and a call interface of a call control module is called to create a call structure body and an RTP socket;
1) The conversation structure body comprises initial parameters and a conversation state;
the method specifically comprises the following steps: constructing a call with a call ID global unique identifier; setting a call state as a call state; analyzing the URL of the IP Camera, and acquiring a used protocol as an RTSP (real time streaming protocol); the number, user name and password information are set to the URL, user name and password of the IP Camera, respectively.
2) The RTP socket is a UDP network monitoring socket for receiving RTP data, and the socket is bound with an IP address and a port of a VoIP phone, is called as an RTP communication protocol address and a port and is used for receiving IP Camera video data;
step three, the call control module transmits the created call structure body and the RTP socket to the RTSP control module, continues to call an interface provided by the CURL through a call interface of the RTSP control module, and sends a DESCRIBE method of the RTSP to the IP Camera;
the call interface parameters of the RTSP control module comprise a call ID, a URL of an IP Camera, a user name and a password;
after the IP Camera receives the DESCRIBE method, the video parameters are replied to the CURL interface in an SDP mode through 200 messages; the CURL interface returns SDP data in the message to the RTSP protocol control module for analysis, and video parameters of the IP Camera are obtained;
step five, the RTSP control module calls an interface provided by the CURL according to the call interface parameters, sends a SETUP method of the RTSP to the IP Camera, and informs the IP Camera of an RTP communication protocol address and a port of the VoIP phone;
the call interface parameter of the RTSP protocol control module comprises an RTP communication protocol address and a port;
step six, after receiving the SETUP method, the IP Camera creates an own RTP communication protocol address and port matched with the RTP communication protocol address and port of the VoIP phone, and replies to the CURL interface through 200;
step seven, after the CURL interface receives the 200 message, the RTP communication protocol address and port of the IP Camera are returned to the RTSP protocol control module;
step eight, the RTSP control module calls a far-end ringing interface of the call control module to perform data processing by using the call ID, the video parameter of the IP Camera, the RTP communication protocol address and the port;
the specific treatment comprises the following steps:
1) Calling a media stream creation interface of the DSP module, and preparing to receive and process the video data of the IP Camera;
the interface parameters comprise video parameters of IP Camera and RTP communication protocol address and port;
2) Updating the call state to a state in the far-end ringing;
3) Calling a call state updating interface provided by the UI module, finishing the display of call information and state and prompting a user in far-end ringing;
the interface parameters comprise the number and the state of the call;
step nine, the RTSP control module calls an interface provided by the CURL to send a PLAY method of the RTSP to the IP Camera and requests the IP Camera to send real-time video data;
step ten, after the IP Camera receives the PLAY method, 200 replies to the CURL interface; starting a camera to collect video, packaging video data into an RTP data packet according to coding specifications and an RTP protocol, and sending the RTP data packet to an RTP communication protocol address and a port of the VoIP phone;
step eleven, simultaneously, the CURL interface informs the RTSP protocol control module of the received 200 messages, the RTSP protocol control module calls a far-end answering interface of the call control module, and the call control module updates the call state to be in call; calling a call state updating interface provided by the UI module, finishing the display of call information and state and prompting a user to establish a call;
step twelve, while the call is established, the DSP module of the VoIP phone processes the video RTP data received by the RTP socket, and displays the video captured by the IP Camera on the display screen of the VoIP phone to realize the access of the IP Camera.
The invention has the advantages that:
an IP Camera access method for supporting RTSP protocol by call control logic is based on VoIP product, and uses user intuitive dialing mode to access IP Camera; the conversion from the conversation control to the RTSP control is realized; the video call between two communication parties is realized, the skill requirements of VoIP phone users are reduced, and the use is easy; meanwhile, the software development cost of the VoIP phone accessing the IP Camera is reduced.
Drawings
FIG. 1 is a schematic diagram of an IP Camera access method supporting RTSP protocol implemented by a call control logic according to the present invention;
FIG. 2 is a flowchart of an IP Camera access method for supporting RTSP through a call control logic according to the present invention;
fig. 3 is a schematic diagram of communication between a VoIP phone and an IP Camera for performing a call according to the present invention.
Detailed Description
To facilitate the understanding and practice of the present invention for those of ordinary skill in the art, the following detailed and deep detailed description of the present invention is provided in conjunction with the accompanying drawings.
The invention discloses a method for realizing IP Camera access supporting RTSP protocol through conversation control logic, which comprises the following steps: a user uses a VoIP phone supporting video encoding and decoding, and an IP Camera URL, a user name and a password to be accessed are configured on a phone self-defined Key (DSS Key); pressing DSS Key configured with IP Camera information on phone hardware, the phone can establish session and video RTP stream with far-end IP Camera through RTSP protocol, and displaying video collected by IP Camera on screen; if the IP Camera supports voice, a voice RTP stream is established at the same time, and the user can hear the voice collected by the IP Camera. The invention adopts the calling mode which is used by people, and simplifies the steps of accessing the IP Camera by the user.
As shown in fig. 1 and 2, the IP Camera access method for supporting the RTSP protocol through the call logic includes the following specific steps:
step one, aiming at a VoIP phone and an IP Camera which need to be communicated, a user configures parameters of the IP Camera to a function Key DSS Key of the VoIP phone;
the parameter configuration comprises the following steps: URL, username and password for IP Camera; the name of the DSS Key can be customized and used for displaying a call interface. The specific configuration process is as follows: through a friendly interface of the VoIP phone, a user can input parameters to the function keys according to the use instruction; or the user inputs the parameters to the function keys by accessing a configuration page provided by the VoIP phone through a browser.
As shown in fig. 3, the VoIP phone includes a user input module, a call control module, an RTSP protocol control module, a DSP module, and a UI (user interface) module.
A user performs key operation through a user input module, constructs a VoIP call request according to the parameter configuration information of the IP Camera, and calls a call interface of a call control module to perform data processing; the processed data is transmitted to the IP Camera through the RTSP control module; meanwhile, the IP Camera feeds back RTP data (RTP) to a DSP (Digital Signal Processing) module, and finally displays the final video through a UI module.
Step two, when a user presses a DSS Key Key configured on a VoIP phone, a trigger Key processing module reads parameter configuration information of an IP Camera, a VoIP call request is constructed, and a call interface of a call control module is called to create a call structure and an RTP socket;
the phone receives the press and lift events of the keys and sends the press and lift events to the DSS Key module to process the keys; the DSS Key module checks Key configuration, acquires configuration information of a user, constructs necessary parameter information (name, url, user name and password) required by VoIP call, and requests the call control module to establish call; the call control module receives call control requests of the DSS Key and the UI, constructs/updates a call structure body, and fills the call structure body according to the received parameter information; maintaining a state machine of the call; informing a phone interface (UI) to display a call state; parameter information (url, user name, password, voice and video coding and decoding capacity, rtp monitoring address and port) required by the RTSP module is constructed, and the RTSP module is notified to initiate an RTSP command;
1) Constructing a call structure body comprising initial parameters and a call state;
the conversation structure includes: a call ID, a call state, a protocol, a number, a user name and a password;
the method specifically comprises the following steps: constructing a call with a call ID global unique identifier; setting a call state as a call state; analyzing the URL of the IP Camera, and acquiring the used protocol as an RTSP (real time streaming protocol); the number, username and password information are set to the URL, username and password of the IP Camera, respectively.
2) Creating a UDP network monitoring socket for receiving RTP data, wherein the socket is called as an RTP socket, binds an IP address and a port of a VoIP phone and is called as an RTP communication protocol address and a port, and is used for receiving video data of an IP Camera;
3) Calling a calling interface of an RTSP control module; the parameters of the interface comprise URL, user name, password, RTP communication protocol address and port of the IP Camera;
4) Calling a call state updating interface provided by a UI module; the interface parameters comprise the number and the state of the call; the interface completes the display of the call information and the state to prompt the user that the call is in progress.
After the construction is completed, transmitting the IP Camera parameter to an RTSP protocol control module, and requesting to establish a call; informing an interface of a VoIP phone to display call information and state, and prompting a user that a call is being established;
step three, the call control module transmits the created call structure body and the RTP socket to the RTSP control module, continues to call an interface provided by the CURL through a call interface of the RTSP control module, and sends a DESCRIBE method of the RTSP to the IP Camera;
the RTSP protocol control module constructs a DESCRIBE method of the RTSP protocol according to the call request and the IP Camera parameters, and converts the DESCRIBE method into RTSP commands (Option, descripte, setup, play and Teardown); data transmission of a protocol is realized through an open source project CURL, and video coding and resolution of the IP Camera are obtained; establishing RTSP conversation by the CURL, sending RTSP command and returning command result;
the CURL is an open source project which is adopted and supports rich communication protocols, wherein the open source project comprises an RTSP protocol; returning the IP Camera video coding and resolution acquired by the RTSP DESCRIBE method to the RTSP protocol control module; the RTSP protocol control module converts the IP Camera video coding and resolution into video coding and decoding parameters supported by the call control module and informs the call control module through an interface;
the call interface parameters of the RTSP control module comprise a call ID, a URL of an IP Camera, a user name and a password;
after receiving the DESCRIBE method, the IP Camera replies its video parameters to the requesting device (here, the CURL interface of the VoIP phone) through 200 messages in the form of SDP (Session Description Protocol); the CURL interface returns SDP data in the message to the RTSP protocol control module for analysis, and video parameters of the IP Camera are obtained;
step five, the RTSP control module calls an interface provided by the CURL according to the call interface parameters, sends a SETUP method of the RTSP to the IP Camera, and informs the IP Camera of an RTP communication protocol address and a port of the VoIP phone;
the call interface parameter of the RTSP protocol control module comprises an RTP communication protocol address and a port;
after receiving the SETUP method, the IP Camera creates an RTP communication protocol address and a port matched with the RTP communication protocol address and the port of the VoIP phone, and replies to a CURL interface through 200;
step seven, after receiving the 200 messages, the CURL interface returns the RTP communication protocol address and port of the IP Camera to the RTSP protocol control module;
step eight, the RTSP protocol control module calls a far-end ringing interface of the call control module to perform data processing by using the call ID, the video parameter of the IP Camera, the RTP communication protocol address and the port;
the specific treatment comprises the following steps:
1) Calling a media stream creation interface of the DSP module, and preparing to receive and process the video data of the IP Camera;
the interface parameters comprise video parameters of IP Camera and RTP communication protocol addresses and ports;
2) Updating the conversation state into a state in the far-end ringing;
3) Calling a call state updating interface provided by the UI module, finishing the display of call information and state and prompting a user in far-end ringing;
the interface parameters comprise the number and the state of the call;
step nine, the RTSP control module calls an interface provided by the CURL to send a PLAY method of the RTSP to the IP Camera and requests the IP Camera to send real-time video data;
step ten, after receiving the PLAY method, the IP Camera replies 200 to the CURL interface; starting a camera to collect video, and packaging video data into RTP data packets according to coding specifications and an RTP protocol to be sent to an RTP communication protocol address and a port of the VoIP phone;
step eleven, simultaneously, the CURL interface informs the RTSP protocol control module of the received 200 messages, the RTSP protocol control module calls a far-end answering interface of the call control module, and parameters comprise call ID; the call control module updates the call state to be in call; calling a call state updating interface provided by a UI module, wherein interface parameters comprise the number and the state of a call; finishing the display of the call information and the state and prompting a user to establish a call;
the call control module checks the video coding and decoding parameters of the IP Camera, compares the video coding and decoding parameters with the video coding and decoding parameters supported by the DSP of the VoIP phone, and judges whether the VoIP phone has the capability of processing the video data of the IP Camera; if yes, informing an RTSP call control module to acquire video data of the IP Camera through an interface, and monitoring according to the video coding and decoding parameters and an RTP; otherwise, informing the RTSP conversation control module to end the access of the IP Camera through the interface; informing a user interface through an interface to display the end of the call and displaying the reason of the failure;
the call control module updates the call state according to the returned result and controls the DSP module to be opened, closed and updated; and informing the UI to refresh the call state and display;
step twelve, while the call is established, the DSP module of the VoIP phone processes the video RTP data received by the RTP socket, and displays the video captured by the IP Camera on the display screen of the VoIP phone to realize the access of the IP Camera.
Claims (6)
1. An IP Camera access method for supporting RTSP protocol by call control logic is characterized by comprising the following steps:
firstly, aiming at a VoIP phone and an IP Camera which need to be communicated, a user configures parameters of the IP Camera to a function Key DSS Key of the VoIP phone;
the parameter configuration comprises the following steps: URL, username and password for IP Camera;
then, when a user presses a DSS Key Key, a Key processing module is triggered to read parameter configuration information of the IP Camera, a VoIP call request is constructed, a call interface of a call control module is called to create a call structure body and an RTP socket, and the call structure body and the RTP socket are transmitted to an RTSP protocol control module;
continuously calling an interface provided by CURL through a calling interface of the RTSP control module, and sequentially sending a DESCRIBE method of the RTSP protocol, a SETUP method of the RTSP protocol and a PLAY method of the RTSP protocol to the IP Camera;
after the IP Camera receives the DESCRIBE method, the video parameters are replied to the CURL interface in an SDP mode through 200 messages; the CURL interface returns SDP data in the message to the RTSP protocol control module for analysis, and video parameters of the IP Camera are obtained;
after receiving the SETUP method, the IP Camera creates an own RTP communication protocol address and port matched with the RTP communication protocol address and port of the VoIP phone, and replies to the CURL interface through 200; after receiving the 200 messages, the CURL interface returns the RTP communication protocol address and port of the IP Camera to the RTSP protocol control module;
meanwhile, the RTSP control module calls a far-end ringing interface of the call control module to perform data processing by using the call ID, the video parameter of the IP Camera, the RTP communication protocol address and the port, and updates the call state into a far-end ringing state;
after receiving the PLAY method, the IP Camera replies 200 to the CURL interface; starting a camera to collect video, packaging video data into an RTP data packet according to coding specifications and an RTP protocol, and sending the RTP data packet to an RTP communication protocol address and a port of the VoIP phone;
meanwhile, the RTSP control module calls a remote answering interface of the call control module, and the call control module updates the call state to be in call; calling a call state updating interface provided by the UI module, finishing the display of call information and state and prompting a user to establish a call; when the call is established, the DSP module of the VoIP phone processes video RTP data received by the RTP socket, and displays the video captured by the IP Camera on a display screen of the VoIP phone to realize the access of the IP Camera.
2. The method as claimed in claim 1, wherein said VoIP phone comprises a user input module, a call control module, an RTSP protocol control module, a DSP module and a UI module;
a user performs key operation through a user input module, constructs a VoIP call request according to the parameter configuration information of the IP Camera, and calls a call control module to perform data processing; the processed data is transmitted to an IP Camera through an RTSP protocol control module; meanwhile, the IP Camera feeds back RTP data to the DSP module, and finally the final video is displayed through the UI module.
3. The method of claim 1, wherein the session structure comprises initial parameters and session status;
the method specifically comprises the following steps: constructing a call with a call ID global unique identifier; setting a call state as a call state; analyzing the URL of the IP Camera, and acquiring the used protocol as an RTSP (real time streaming protocol); the number, the user name and the password information are respectively set as the URL, the user name and the password of the IP Camera;
the RTP socket is a UDP network monitoring socket for receiving RTP data, and the socket binds an IP address and a port of the VoIP phone, and is called an "RTP communication protocol address and a port" and is used for receiving video data of an IP Camera.
4. The method of claim 1, wherein the call of the session control module corresponds to RTSP protocol control module implementing DESCRIBE and SETUP methods of RTSP protocol through CURL;
when the DESCRIBE method of the RTSP protocol is sent, the call interface parameters of the RTSP protocol control module comprise a call ID, a URL of an IP Camera, a user name and a password;
when the SETUP method of the RTSP protocol is sent, the call interface parameters of the RTSP protocol control module include an RTP communication protocol address and a port.
5. The IP Camera access method for supporting RTSP protocol implemented by the call control logic of claim 1, wherein the update of the call status to the far-end ringing status means receiving a 200 response of RTSP protocol SETUP method;
the RTSP control module calls a far-end ringing interface of the call control module to perform data processing, and the data processing comprises the following steps:
1) Calling a media stream creation interface of the DSP module, and preparing to receive and process the video data of the IP Camera;
the interface parameters comprise video parameters of IP Camera and RTP communication protocol addresses and ports;
2) Updating the call state to a state in the far-end ringing;
3) Calling a call state updating interface provided by the UI module, finishing the display of call information and state and prompting a user in far-end ringing;
the interface parameters include the number and status of the call.
6. The method of claim 1, wherein the session status update is a PLAY method in which the RTSP protocol control module implements the RTSP protocol via CURL and receives a 200 response from the IP Camera.
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